Air Fryer Chicken Tikka Masala

For the Chicken Tikka:

• 1 lb boneless chicken thighs or breasts, cut into chunks
• ½ cup Greek yogurt
• 1 tablespoon lemon juice
• 1 tablespoon ginger-garlic paste
• 1 teaspoon turmeric
• 1 teaspoon garam masala
• 1 teaspoon ground cumin
• 1 teaspoon ground coriander
• 1 teaspoon paprika
• ½ teaspoon chili powder (optional)
• ½ teaspoon salt
• ½ teaspoon black pepper
• 1 tablespoon oil

For the Masala Sauce:

• 1 tablespoon butter or ghee
• 1 small onion, finely chopped
• 1 teaspoon ginger-garlic paste
• 1 teaspoon ground cumin
• 1 teaspoon garam masala
• ½ teaspoon ground coriander
• 1 teaspoon paprika
• 1 cup tomato purée
• ½ cup heavy cream or coconut milk
• ½ teaspoon salt
• ½ teaspoon black pepper
• 1 teaspoon sugar (optional)